Auxiliary carburetor



ZSheets-Sheet 1 C. M. DAWDY AUXILIARY CAHBURETOR Filed- Jan. 7, 1925 Nov. 17, 1925.

iii 10 Nov. 17, 1925. 1,562,301

C. M. DAWDY AUXILIARY CARBURETOR Filed Jan. 7, 9 5 2 Shets-Sheet 2 31mm 1912. UMpawd A na Patented Nov. 17, 1925. g

UNITED "PATENT. err-ice.

onynn ne DY, or BOONE, IOWA.

AUXILIARY ennronnron.

' .Applieationfiled aanuar v, 1925. Serial-No.1,096.

To ay- 101mm git mag poncenn: --ing;und erstood that changes in form, size, Be t known th tI, EGIIYgDE M. DAWDY, proportion .of parts and imlnOI'[ (18t-IilS--H1ty Boone, in the countcyof jBooneand-State of scope of the ,innentionasiclaimed 5 :l0 T l lit f a cit zen of the United States, residingat be made. said changes being Within'the .iIIQPIQXfiPlQQlS in an r liary Carburetor, an automobile =.pro.vided 'vith." the device. of whic-l the following 1s aspec fication. Fig. 2 1S a iview in dongitudinal section .of

This inyen-tmnhasfor its object, broadly, a t ,.\'-o-,par t construction for the auxiliary to provide anpilor gasoliue driven engine carburetor. Fig. 3visaside view showing a With an auxiliary carburctorndapted to deapart of a gas engine provided .with the .deliver to the intake manifold a mixture of vice. Fig. l is a .view in longitudinal secapors and gasesobtained fromtwo sources. tion of the auxiliary carburetor Fig. 5 is one from-thecrank case by communicating a transverse section on line 5-5 of Fig. 4., avith gthe breathe :Hllle 01 Same, the other {the View being on an enlarged .scale. Fig. including moisture and air from the radi- 6 is aside View of .a' slidealve. 4 ig. 7 "is ator,.-the vaporsbeing delivered to and treata side View of a compartment foptheupper .ed by the auxiliary .carburetor before .depart of the device. tEig. 8 is a side view of livery to the intake gnanifold. a compartment for the lower part .of .the Tl' e-two aporsthus combined ;md mixed -.de.Vic-e. Fig. 9 .lS";l:bOlltO111 .plan .view .of the 20 by the hereindescribed device form a comcompartment shown in Fig. :7. fig. .10 is 7 bustible ;l1 1 l$t1118;tl1l is added to the gaseous a transverse section .on line .10:10.of F ig. mixture of the ,conyentional carburetor of S. Fig. 11 isja sectional view-,on line 11 of vthe 'engine and on accountiofthe construc- :Fig. 6. FigkslQ is .a transverse section tion (now provided the fuel mentioned is through ,the lower compartment. on line 5 thoroughlybroken up and mixed in a manz12.12 of Fig. 10.

nerto rendeinit nore favorable for combuslhe present invention is shown and detion, thereby to obtain a more uniform scribed in connection with a conventional power and flexibility for the engine, and carburetor 1 and .the intake manifold 20f a tending to prevent carbon deposits. gasoline.engine,kalsolin connection with the :30 Anotheryobject is to provide a device for overflow pipe 3 of a radiator A, and the the purposes mentioned which will consist breather-pipe 5' of a crankecase 6 50f said of few and simple parts and which vmay be engine. In the drawings, like characters readily applied to ,any engine of ordinary indicate like parts inqthe several .views. construction without interfering with the ln order that -,the objects ifiISt,me1 1tlO1l8Cl 3. working-parts thereof. may beattained, Iprovide-partsiforan aux- A-furtber object isto provide an auxiliary iliary carburetor which may .consist of the carburetonof such construction that the inupright, cyli ndrical.casing '17 shoxvnin Fig. take manifold will receive therefrom ,a .flow hand parts therein and connecteditherewith,

' first be. explained.

o heate a d porized 1 2. eent iiell d th s n l 40 by emotio of th e gi lllli nren jiq Milli-1119131118lfidicfitesia' ylindvica'l' 'YBC-QP' nc ud ah 11138 of a upri h elite-Naive e iad p efl tv ee ,=-12r e a y ya operated by the snet' on. entioned, 'and threaded connection, .iuthe upper endofgthe g 37, saidmeceptacle:being-proyidedmith g ue i fil ing and m rsh semm fue mlQ 'yiillll l am 'in '9u e .he iereg ing .obie S in $51.93" and annu arel amher{10m ibat m othe .1 [b mention d Zfi e iin a le- .1 12 r with a fll fl yish w sea s. .im e ardiis iu selisti- .1 n zEigsf y -endi-9, anettur b i s1 nation and. semen o rerfisas de- .th par i on v T ith it eq mpan e s s nihe vhereie med .91 :1 1. 12 1 5 10 .W efim' un eefi b ggd arenas i 'b Miner iudipatesaie adapted 2& rem- & n t "W ile th 51 @15 certam-neyrnnd useful ilnthe .clraivi11gs,.F -g. :1u1s -a.-s1de yiew of tacle adapted to be secured in the lower end of the casing 7, said receptacle being provided with an inner and an outer chamber respectively indicated at 13 and let, the partition 15 between said chambers being provided with numerous apertures c. in the upper wall of the chamber 13 and centrally thereof is provided a seat (Z for a needle valve having a stem 16 threaded in the top of the receptacle 8, and adapted to be unde control of a lock-nut 17.

Numeral 18 indicates a compartment formed in the upper part of the receptacle 12 adapted to communicate with the chamber 18 subject to the control of the needle valve; and the top or upper end of the cylindrical receptacle '12 is provided with apertures 'e.

Numeral 19 indicates a comparatively long chamber in the casing 7, said chamber 19 be ing disposed between the receptacles 8 and 12. I provide an elongated, hollow slidevalve 20, its top f and bottom 9 being of disc-form with diameters slightly less than the diameter of the bore of the casing 7 and it will be understood that this valve may have upward sliding movements caused by suction of the engine, its top f engaging the bottom of the receptacle 8 when said valve moves upwardly, and its bottom 5 engaging the top of the receptacle 12 when moving downwardly, these engagements being in alternation. j 7

It will be noted that, to avoid friction, this valve is approximately of concave form, between its ends, the only parts which may loosely engage the walls of the casing 7 be ing the parts f and g. Numeral 21v indicates a by-pass traversed by the stem 16 of the needle valve, said by-pass being at all times in communication with the elongated chamber 19 on account of the apertures h and which are formed in the sides of the valve, the bottom preferably being imperforate, and the top f, at its middle, being provided with an aperture m. V

Numerals 22 and 23 indicate intake pipes for the chamber 14, the pipe 22 having a branch at communicating with the breather tube 5 of the crank case 6, and having a branch 72 communicating with the overflow pipe 3 of the radiator 4, the pipe 23 operating to furnish a suitable supply of gasoline or similar element to said chamber 14-, subject to the control of a valve 26, and in operation the gasoline may be used or may be dispensed with, depending upon requirements and conditions. Numeral 2 1 indicates a discharge pipe provided for the chamber 10 and which communicates with the intake manifold.

As thus described the parts are very effective for mixing; the vapors from the crank case and radiator and also gasoline, and for automatically discharging the mixture to the intake manifold, said vapors becoming thoroughly mixed in said manifold with the mixture coming thereto from the carburetor 1, this last named mixture being effectively broken up to be delivered, jointly with the vapors thus mixed by the present device, to the engine cylinders in a manner to effect uniformity of power and flexibility of the engine.

It will-be seen that vapors from the crank case and radiator are first joined in the intake pipe 22, both vapors generally being in a heated condition, and after entering the chamber 1-1 they pass through the perforations 0 and must pass the seat of the needle valve in order to enter the chamber 19 by passing through the apertures e whenthe slide valve 20 moves upwardly by operation of the suction mentioned.

When the valve 20 slides upwardly, the mixture above the base 9, or the greater part of said mixture, will be carried upwardly and will pass through the comparatively small apertures or perforations a into the chamber 9, and will be discharged through the pipe 24: to the intake manifold by passing through the apertures b. It will thus be seen that, on account of the construction, the vapors will become thoroughly mixed before entering the intake manifold.

By referring to Fig. 5 it will be seen that when the upper end of the slide valve engages the bottom of the receptacle 8 said part 7 will cover approximately one-half of the areas of the apertures a, this being a de sired feature for causing a still further mixing of the vapors by operation ofsuction, and being effective for that purpose for the reason that suction will continue after the slide valve has moved upwardly into engagement with said receptacle 8 and while the apertures a are partly, covered.

It is understood, of course, that an upward movement of the slide valve tends to draw the vapors from the crank case and radiator into the several chambers 14,-, 13, and 18 and into'the lower part of thechamber 19 by passing through the several apertures cand 0 and valve seat (Z, and when the slide valve moves downwardly the mixed vapors thus contained in that part of chamber 19 below said valve, will move upwardly through the by-pass21 and through the limited annular areas; between the members 7'' and g and the" adjacent walls of the cylindrical casing 7,- this limited area permitting a free downward movement of the slide valve.

. In some instances a two-part auxiliary carburetor, illustrated in Fig. 2 of the drawings, is of advantage, and since the parts for this construction are the same as already described, a description in detail thereof is not considered necessary exce t to state that the chambers 14% of the cylin rical casings are in communication by means of a pipe 23 iseaeoi provided with an intake pipe to permit is ql n inc-enter u je he ontrol of a valve 26. p

Also, in this two part construction, .the chamber 14; of each cylindrical casing 7 is provided with an intake pipe 22" having branches at and 79 adapted to communicate respectively with tlre breather-pipe 5 of the crank case and overflow pipe 3 of the radiator. Also, in this two-part construction, a pipe 24 communicates with each chamber 10 of a cylindrical casing 7 said pipe 24 being provided with a conducting pipe 27 adapted to communicate with the intake manifold.

While in the drawings I have shown my improvements in connection with gas engines for automobiles, it is obvious that the same may be applied to gas engines generally; and since operation is the same I may employ a single casing or two or more casings 7 and their connections for utilizing the vapors from the crank case and radiator.

On account of the great advantage derived by the shuttle-like movements of the slide valve the device is operative in a measure, without providing the communicating chambers 9, 10, 12, 13 and 14, also I may dispense, in some instances, with the needle valve, and I do not wish to be limited to the use of these elements.

I claim as my invention,-

1. In an auxiliary carburetor, a cylindrical casing, .a cylindrical receptacle within and closing one end of the casing, said receptacle being provided with annular chambers in communication with each other and having a valve seat formed in its inner end, a second cylindrical receptacle within and closing the opposite end of the casing, said second receptacle being provided With annular chambers in communication with each other and having apertures formed in its inner end, a hollow slide valve disposed within the casing to permit movements between said receptacles and having a by-pass in communication with the annular chambers of the second receptacle, a needle valve for said valve seat, said needle valve having a stem traversing the by-pass and threaded in the second cylindrical receptacle, an intake pipe having branches in communication with a chamber or the first named cylindrical receptacle, and a discharge pipe in communication with a chamber of the second cylindrical receptacle.

2-. In an auxiliary carburetor, a cylindri- ('al casing, a pair of cylindrical receptacles disposed in the ends of said casing and pr0- riding an elongated chamber between and in communication with said receptacles, one of said receptacles being provided with a valve seat, a slide valve having a by-pass disposed in said elongated chamber, a needle valve for said valve seat having a stem mounted e 11 one 10f the necep-tacleszof saidipairyancl rtraversi-ng ithe by-pass, :an intake pipe shaviing branches communicating withioneiof said rec ptac es, and a discharge sPiP-E communiting wi h. th othe rec ptacle o sa pair- 2 nauxi i ycarbu e r, arissa r i o escapade isposed t e nds :Q sai -sins. an rmidias an ,elei sated chamber between and communicating with said receptacles, one of the receptacles of said pair being provided with a valve seat and a plurality of intake pipes, the other receptacle of said pair being provided with a discharge pipe, a slide valve having a bypass and disposed in said elongated chamber, and a needle valve for said valve seat having a stem threaded in one of the receptacles of said pair and traversing said bypass.

4;. In an auxiliary carburetor,the combination with a casing having an intake port and a discharge port near its ends, of a pair of receptacles closing the ends of the casing and providing an elongated chamber between said receptacles, each receptacle having ports communicating with said chamber and one of said receptacles having a valve seat, a needle valve for said valve seat having a stem traversing said chamber, and an apertured slide valve having a by-pass receiving the stem of the needle valve and disposed loosely in said chamber to permit it to be moved by the suction of the engine.

5. In an auxiliary carburetor, the combination with a casing closed at its respective ends and having an aperturedpartition adjacent to one of its ends, a discharge pipe communicating with that end of the casing outwardly of said apertured partition, a slide valve in the casing having a by-pass and having an aperture in one of its, ends communicating with the by-pass, an intake pipe communicating with the closed end of the casing opposite to said apertured partition for conducting a fuel mixture to said casing for moving the slide. valve into engagement with said partition to obstruct a part of the areas of the apertures of said partition.

6. In an auxiliary carburetor an upright casing, an apertured receptacle having a valve seat and mounted in the lower end of the casing, an apertured receptacle nor mally in communication with the first named receptacle and mounted in the upper end of the casing, a slide valve for said valve seat having a stein threaded in the upper receptacle and engaging in said by-pass, a discharge pipe communicating with the upper receptacle, and a plurality of intake piples communicating with the lower receptac e.

7. In an auxiliary carburetor, an upright casing, a plurality of communicating cham: here n the lower part of the casing, a plurality of communicating chambers in the casing, and intake pipes for conducting a upper partvof the casing in communication fuel mixture, said intake pipes being in 10 with the first named chambers, a slide Valve g muni ation with the first named cham- 9 13 disposed in the casing between the bers for moving the slide Valve. lower and upper chambers and having a I testimony whereof, I have afiixed my by-pass communicating With all of said i t chambers, a discharge pipe communicating with the chambers in the upper part of the v CLYDE M. DAXVDY 

